Did he, really?
The answer is, of course, no he didn't. He destroyed it so much that, just 15 days ago, there were the 4 yearly EU elections for a new EU Parliament. Those elected are now juggling themselves together into their little political enclave groups to see which group has the most MEPs. Then the new commission will be appointed and off they go on the next 4 year chapter of the institution you believe to have been destroyed.
There are, indeed more right wing MEPs this time round. They've grown in number in their own countries of late and a similar outcome in "Brussels" was as clear as daylight. I, for one, am not surprised that it happened. Totally logical that it would. It's also totally logical that their influence will, over the next 2 or 3 election cycles, both nationally and in the EU, lose ground and once more become the irrelevance they were 10 years ago. Why? Simply because they are, basically, one policy parties. Immigrant bashing. They also have a lot to say on all the tings they perceive their national governments have got wrong. What they say, and never have, never will, is what they would do if in power.
Take the Dutch PVV (please, somebody take them

). The party has ONE member, Wilders. He built up a following by hammering immigration, hammering Islam, pointing out what he found wrong with governement policy. He did that without explaining what he'd do to rectify all the problems. He never offered a single solution, Why not? Because he doesn't have one.
Now he's the largest single party in the Netherlands with 37 of the 150 seats. That meant he had to form a coalition. I didn't think he's manage it but he has. His "partners" are the BBB (Farmer and Public Movement) who have sided with the PVV throughout this election. The new NSC (New Social Contract) who always said they'd never join a Wilders pact but have. Why they changed tack is clear. Their leader, Peter Omtzigt, is probably the best Parliamentarian we've had in my 40 years of living here. He got into talks, got most of what he wanted. He got Wilders to agree that each and every Law and Policy had to be 100% legal, within the Constitution AND executable. That led to Wilders dropping his Ultra right wing plans to ban the Koran, lose Mosques etc. Then they got into the nitty gritty. He had promised to scrap the Health Insurance excess of €385 a year. He regularly hammered the VVD, the CDA, D66 and other parties because they didn't announce that policy. The recently reached coalition agreement will reduce the excess by about 40%... in 2027. they hope to be able to afford it. Another election promise was a large rise in the minimum wage. That has been sccrapped. There's more of the same but you get the gist. He scrapped a lot of his election promises because they were either illegal or unaffordable or just simply aren't workable. He will disappoint his voters. Next election he will do well again as he will blame the "other parties". He may well be given a 2nd chance by the voters but, he'll fail again for the same reasons. Legal issues, unworkable or unaffordable. Over 2 or 3 election cycles his share of the vote, both for den Haag and for Brussels will shrink.
It is my opinion that the AfD in Germany and the other far right populists will suffer the same fate. they found an audience but their "fame" will not survive more than a couple of elections. Why? because their policies are NOT for the good of the populace as a whole. Jingoism at best.